Have EditCommand classes deal with Document references, not pointers

Source/core/editing/IndentOutdentCommand.h

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 #define IndentOutdentCommand_h
 
 #include "core/editing/ApplyBlockElementCommand.h"
 #include "core/editing/EditAction.h"
 
 namespace WebCore {
 
 class IndentOutdentCommand : public ApplyBlockElementCommand {
 public:
     enum EIndentType { Indent, Outdent };
-    static PassRefPtr<IndentOutdentCommand> create(Document* document, EIndentType type, int marginInPixels = 0)
+    static PassRefPtr<IndentOutdentCommand> create(Document& document, EIndentType type, int marginInPixels = 0)
     {
         return adoptRef(new IndentOutdentCommand(document, type, marginInPixels));
     }
 
     virtual bool preservesTypingStyle() const { return true; }
 
 private:
-    IndentOutdentCommand(Document*, EIndentType, int marginInPixels);
+    IndentOutdentCommand(Document&, EIndentType, int marginInPixels);
 
     virtual EditAction editingAction() const { return m_typeOfAction == Indent ? EditActionIndent : EditActionOutdent; }
 
     void indentRegion(const VisiblePosition&, const VisiblePosition&);
     void outdentRegion(const VisiblePosition&, const VisiblePosition&);
     void outdentParagraph();
     bool tryIndentingAsListItem(const Position&, const Position&);
     void indentIntoBlockquote(const Position&, const Position&, RefPtr<Element>&);
 
     void formatSelection(const VisiblePosition& startOfSelection, const VisiblePosition& endOfSelection);
     void formatRange(const Position& start, const Position& end, const Position& endOfSelection, RefPtr<Element>& blockquoteForNextIndent);
 
     EIndentType m_typeOfAction;
     int m_marginInPixels;
 };
 
 } // namespace WebCore
 
 #endif // IndentOutdentCommand_h